| Chassis and Powertrain Formulas |
| Air Capacity & Volumetric Efficiency Formulas |
| » High Perf. Carburetor CFM = RPM x Displacement / 3456 x 1.1 |
| » Street Carburetor CFM = RPM x Displacement / 3456 x 0.85 |
| » Theoretical CFM = RPM x Displacement / 3456 |
| » Volumetric Efficiency = Acutal CFM / Theoretical CFM x
100 |
| Bore, Stroke and Displacement Formulas |
| » Cylinder Volume = pi/4 x Bore2 x Stroke (pi/4 = 0.7853982) |
| » Stroke = Displacement / (pi/4 x bore2 x number of cylinders) |
| Brake Horsepower Formulas |
| » BHP Loss = Elevation in Feet / 1000 x 0.03 x BHP at Sea
Level |
| » Brake Specific Fuel Consumption = Fuel Pounds Per Hour / Brake
Horsepower |
| » Horsepower = RPM x Torque / 5252 |
| » Torque = 5252 x Horsepower / rpm |
| Center of Gravity Formulas |
| » Center of Gravity Location (behind front wheels) = Rear Wheel Weights / Overall Weight x Wheelbase |
| » Center of Gravity Location (off-center to heavy side) = Track / 2 - [ Weight on Light Side / Overall Weight ] x Track |
| » Center of Gravity Height = [ Level Wheelbase x Raised Wheelbase x Added Weight on Scale / Distance Raised ] x Overall Weight |
| Compression Ratio Formulas |
| » Amount to Mill = (New Displacement Ratio - Old Displacement Ratio / New Displacement Ratio x Old Displacement Ratio) x Stroke |
| » Chamber Volume = Cylinder head cc + gasket cc + dish of piston cc (or) - dome of piston cc |
| » Compression Ratio = (Cylinder Volume + Chamber Volume) / Chamber Volume |
| » Cylinder Volume = pi/4 x bore(2) x stroke |
| » Displacement Ratio = Cylinder Volume / Chamber Volume |
| G-Force & Weight Transfer Formulas |
| » Centrufugal Force = Weight x G |
| » Drive Wheel Torque = Flywheel Torque x First Gear x Final Drive
x 0.85 |
| » G = Wheel Thrust / Weight |
| » Lateral Acceleration = 1.227 x Raduis / Time2 |
| » Lateral Weight Transfer = Weight x Center of Gravity Height / Wheel Track x g |
| » Weight Transfer = Weight x Center of Gravity Height / Wheelbase x G |
| » Wheel Thrust = Drive Wheel Torque / Rolling Radius |
| Indicated Horsepower and Torque Formulas |
| » Friction Output = Indicated Output - Brake Output |
| » Mechanical Efficiency = Brake Output / Indicated Output x
100 |
| » MEP = HP x 792,000 / Displacement x RPM |
| » Taxable Horsepower = Bore2 x Cylinders / 2.5 |
| » Torque = MEP x Displacement / 150.8 |
| Instrument Error Formulas |
| » Actual MPH = 3600 / seconds per mile |
| » Indicated Distance = odometer reading at finish - odometer
reading at start |
| » Odometer Percent Error = difference between actual and indicated
distances / actual distance x 100 |
| » Speedometer Error Percent = difference between actual and indicated
speed / actual speed x 100 |
| Piston Speed Formulas |
| » Piston Speed in FPM (Feet Per Minute) = Stroke in inches x RPM / 6 |
| » RPM = Piston Speed in fpm x 6 / Stroke in inches |
| Tire Size & Effect Formulas |
| » Actual MPH = (New Tire Diameter / Old Tire Diameter) x Actual MPH |
| » Effective Ratio = (Old Tire Diameter / New Tire Diameter) x Original Ratio |
| » Gear Ratio = (RPM x Tire Diameter) / (MPH x 336) |
| » MPH = (RPM x Tire Diameter) / (Gear Ratio x 336) |
| » RPM = (MPH x Gear Ratio x 336) / Tire Diameter |
| » Tire Diameter = (MPH x Gear Ratio x 336) / RPM |
| Transmission Shift Point Formulas |
| » RPM After Shift = Ratio Shift Into / Ratio Shift From x RPM
Before Shift |
| » Drivehsaft Torque = Flywheel Torque x Transmission Ratio |
| Weight Distribution Formulas |
| » Percent of Weight on Wheels = Weight on Wheels / Overweight x
100 |
| » Increased Weight on Wheels = [ Distance of Center of Gravity from Wheels /
Wheelbase x Weight ] + Weight |
